Shouldn't be a problem, it will probably need to be mounted at an angle though. I have a 12 and there is only a couple of inches top and bottom once it's all boxed up.
Last edited by jame5; 15/06/201123:34. Reason: shameless pic of my install!
make a sub build of your own outta wood or fibre glass you can then define the dimensions the required volume of the unit according to the size of the sub